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add langchain and google_test
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‎docs/ai/index.md

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# AI相关
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# 人工智能
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!!! quote ""
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"Artificial intelligence is not a substitute for human intelligence; it is a tool to amplify human creativity and ingenuity."
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-- Fei-Fei Li
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## 参考资料
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- [LangChain](https://python.langchain.com/docs/introduction/)
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‎docs/ai/llm/index.md

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# LLM
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- [LangChain](./langchain.md)
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‎docs/ai/llm/langchain.md

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‎docs/images/ai/know_base.png

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‎docs/pl/cpp/google_test.md

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# Google Test
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谷歌测试框架(Google Test)是一个用于编写和运行 C++ 单元测试的强大且灵活的测试框架。它由 Google 开发并广泛应用于各种 C++ 项目中。它主要的功能如下：
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- 断言：支持多种类型的断言，如`ASSERT_EQ`、`EXPECT_TRUE`等。
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- 测试夹具：允许在每个测试之前和之后设置和清理测试环境
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- 参数化测试：支持参数化方式运行相同的测试用例
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- 死亡测试：支持测试程序在特定条件下是否会正确终止
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假如有项目结构如下所示：
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```SHELL
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goole_test/
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├── CMakeLists.txt
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├── src
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│ ├── add.cpp
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│ └── add.h
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└── tests
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└── test_add.cpp
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```
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其中源代码文件`src/add.cpp`和头文件`src/add.h`如下所示：
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```CPP
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// add.h
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#ifndef ADD_H
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#define ADD_H
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int add(int a, int b);
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#endif // ADD_H
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// add.cpp
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#include "add.h"
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int add(int a, int b) {
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return a + b;
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}
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```
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测试文件`tests/test_add.cpp`如下所示：
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```CPP
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#include "gtest/gtest.h"
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#include "add.h"
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TEST(AdditionTest, PositiveNumbers) {
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EXPECT_EQ(add(2, 3), 5);
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}
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TEST(AdditionTest, NegativeNumbers) {
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EXPECT_EQ(add(-2, -3), -5);
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}
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TEST(AdditionTest, MixedNumbers) {
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EXPECT_EQ(add(-2, 3), 1);
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}
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```
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CMakeLists.txt 文件如下所示：
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```CMAKE
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cmake_minimum_required(VERSION 3.10)
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project(MyProject)
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# 查找Google Test库
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find_package(GTest REQUIRED)
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# 包含头文件目录
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include_directories(src)
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# 添加可执行文件
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add_executable(test tests/test_add.cpp src/add.cpp)
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# 链接Google Test库（包括默认main函数）和线程库
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target_link_libraries(test GTest::GTest GTest::Main)
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```

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